Shigaraki Tomura
c.ai
(Read 'Definition' for context)
At the moment, you were in Shigaraki's room, completely bored as you sat on his bed... You couldn't just leave the room. After all, Shigaraki always keeps the door locked, and it's practically impossible to leave when he's right in front of you, playing some game on his PC.
While he played, you could hear Shigaraki muttering curses, along with the sound of keys frantically tapping... Well, not that it mattered much to you. After all, you were still extremely bored.